Changed print out when a locust class has no tasks, to issue a warnings.warn() instead.
Changed print out when a locust class has no tasks, to issue a warnings.warn() instead.

santiavenda2/locust,fordhurley/locust,locustio/locust,yangchaogit/locust,donglei/locust,liubq919/locust,harrisonfeng/locust,rohitgup14/locust,locustio/locust,rohitgup14/locust,lixar/locust,fengshao0907/locust,wndhydrnt/locust,Diogo-Costa/locust,heyman/locust,bugsduggan/locust,RollForReflex/locust,bugsduggan/locust,doctoryes/locust,nagyistoce/locust,TZer0/locust,moongtaeng/locust,RollForReflex/locust,pmdarrow/locust,edx/locust,dmoliveira/locust,normanb/locust,mbeacom/locust,fengshao0907/locust,cloudant/locust,scalp42/locust,pan1cz/locust,agoragames/locust,kentzzhang/locust,cpennington/locust,cpennington/locust,noif/locust,rackerlabs/locust,timaakulich/locust,cloudant/locust,normanb/locust,noif/locust,nagyistoce/locust,minhoryang/locust,scalp42/locust,jacobgardner/locust,lixar/locust,timaakulich/locust,donglei/locust,RollForReflex/locust,kyroskoh/locust,locustio/locust,noif/locust,TZer0/locust,noif/locust,leo23/locust,moongtaeng/locust,rohitgup14/locust,Diogo-Costa/locust,liubq919/locust,fordhurley/locust,armersong/locust,harrisonfeng/locust,mbeacom/locust,agoragames/locust,jaume-pinyol/locust,locustio/locust,doctoryes/locust,edx/locust,fengshao0907/locust,timaakulich/locust,edx/locust,minhoryang/locust,jaume-pinyol/locust,cpennington/locust,edx/locust,leo23/locust,mbeacom/locust,Diogo-Costa/locust,kentzzhang/locust,yangchaogit/locust,pglass/locust,rohitgup14/locust,ismail-s/locust,armersong/locust,donglei/locust,liubq919/locust,pmdarrow/locust,dmoliveira/locust,rackerlabs/locust,yangchaogit/locust,RollForReflex/locust,cloudant/locust,santiavenda2/locust,pan1cz/locust,yangchaogit/locust,scalp42/locust,fengshao0907/locust,jacobgardner/locust,doctoryes/locust,harrisonfeng/locust,dmoliveira/locust,pan1cz/locust,normanb/locust,fordhurley/locust,cgoldberg/locust,kyroskoh/locust,wndhydrnt/locust,kyroskoh/locust,dmoliveira/locust,Diogo-Costa/locust,cpennington/locust,agoragames/locust,pglass/locust,pglass/locust,cgoldberg/locust,rackerlabs/locust,doctoryes/locust,wndhydrnt/locust,wndhydrnt/locust,bugsduggan/locust,TZer0/locust,mbeacom/locust,lixar/locust,ismail-s/locust,moongtaeng/locust,armersong/locust,jaume-pinyol/locust,moongtaeng/locust,armersong/locust,nagyistoce/locust,donglei/locust,lixar/locust,cgoldberg/locust,kentzzhang/locust,leo23/locust,kentzzhang/locust,pmdarrow/locust,santiavenda2/locust,minhoryang/locust,cloudant/locust,ismail-s/locust,jacobgardner/locust,leo23/locust